Human organisms are complex living beings made up of cells, tissues, and organs that work together to maintain life. Each human has a unique genetic makeup, which influences physical traits and health. The body is organized into systems, such as the circulatory system, nervous system, and digestive system, each performing specific functions essential for survival. Humans are classified as homo sapiens, a species that exhibits advanced cognitive abilities, including reasoning and problem-solving. They are social creatures, often living in communities and forming relationships. The study of human organisms encompasses various fields, including biology, anatomy, and physiology.